Pencil sharpener



FIG. 1 is a right front top perspective view of the pencil sharpener;

FIG. 2 is a front view thereof;

FIG. 3 if a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a left rear bottom view thereof. The broken lines showing an eraser and a portion of a pencil are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a pencil sharpener, as shown and described. 